Long slope steepness along north of of Great Wall from Tao2linkou to Baiyangyu

[andarchen]

Since google earth satallite image was improved recently on this section of 30km long Great Wall ,you can easily find there were several lines of slope steepness few meters north of Great Wall ,it is special defence way in Heibei east only .

[Kim]

Do you mean the ditch north of the wall?

[andarchen]

Originally Posted by Kim

Do you mean the ditch north of the wall?

Thank for your picture , it is what i said .

[Kim]

Here is another example (Liujiakou):

[andarchen]

it most appears flat slope but steep hills.